Nintex Newbie

O365 - Call HTTP Web Service failed - Unauthorized "Access denied"

Hi Team,  Facing error while using Http web service: GET method to retrieve sub-site list item columns from the root site in NINTEX Workflow.  {"error":{"code":"-2147024891, System.UnauthorizedAccessException","message":{"lang":"en-US","value":"Access denied. You do not have permission to perform this action or access this resource."}}}  Used elevated permissions, still am facing the issue ,, referred this article.

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